Setting Up The Hp 8564E Spectrum Analyzer; Making The Measurement Using Peak Detection - HP 84125C User Manual

Setting Up the HP 8564E Spectrum Analyzer

Making the Measurement Using Peak Detection

Tip
Set up the spectrum analyzer to measure harmonic emissions as
follows:
FREQUENCY
1. Press
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frequency to the rst harmonic.
2. Press
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step size of 830 MHz.
SPAN
3. Press ,
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discern the signals.
4. Set up the limit line for a 1-meter FCC test by pressing,
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,
or the appropriate limit for the regulation being tested.
1. Place the EUT (in this case, the cellular telephone) on a
nonconductive surface and position the antenna 1 meter away
from the cellular telephone at the height speci ed by the
regulation. Make sure that the cellular telephone is on.
2. Move the antenna 360  around the EUT to nd the direction of
maximum radiation for the rst harmonic (that is, 1.66 GHz). The
test set has been designed with three handles to make it easy to
use in both vertical and horizontal polarizations.
3. If the noise level at the frequency of the emission is greater than
10 dB below the limit, move the antenna to 3 meters away from
the EUT and repeat the above procedure. For emissions that fall
close to the 64 dB  V/m limit line, the limit line can be changed to
54 dB  V/m (the 3-meter limit)
a. Press
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If the amplitude of the signals fall signi cantly below either
the 54 dB  V/m display line (approximately 6 dB) at a distance
of 3 meters or 64 dB  V/m limit line at 1 meter or less, then the
harmonic amplitude passes the requirement.
Make a list of the signals that fail this guideline, then repeat the
procedure using average detection after all of the harmonics have
been tested using peak detection.
AMPLITUDE
4. Press ,
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the signal near the top of the display.
5. To record the amplitude of the harmonic:
a. Press
MODULE
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marker on screen and several marker functions.
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,
MHz
, to set the center frequency
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MHz
, or to a value that allows you to clearly
5
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,
dBm
.
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and adjust the reference level to bring
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, ,
GHz
to set the center
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MODULE
4
 to activate the
Making Measurements 6-3
,
5
dBm
,
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